/* CSS Document */
#tieude
{
	background-color:#999999;
	height:30px;
	width:100%;	
}
#content{
	width: 90%;
	padding:20px;	
}

#screen{
	width: 100%;
	height: 900px;
	overflow:scroll;
	padding:20px;	
}
#feedback{
	background-color:#666;	
}
#example 
{
	min-height:500px;
}

#undo {
	text-align: center;
	position: absolute;
	white-space: nowrap;
	padding: 1em;
	cursor: pointer;
}
.armchair {
	float: left;
	margin: 30px 30px 120px 30px;
	text-align: center;
}
.armchair img {
	display: block;
	margin-bottom: 10px;
}
